linux-kernel - Re: [PATCH v5 7/7] ARM: dts: sun8i: v40: bananapi-m2-berry: Add Bluetooth device node

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Message-ID: <20190502074103.vtuxmsl55u3ygyvl@flea>
Date:   Thu, 2 May 2019 09:41:03 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Pablo Greco <pgreco@...tosproject.org>
Cc:     linux-sunxi@...glegroups.com, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 7/7] ARM: dts: sun8i: v40: bananapi-m2-berry: Add
 Bluetooth device node

On Tue, Apr 23, 2019 at 02:26:04PM -0300, Pablo Greco wrote:
> The AP6212 is based on the Broadcom BCM43430 or BCM43438. The WiFi side
> identifies as BCM43430, while the Bluetooth side identifies as BCM43438.
>
> The Bluetooth side is connected to UART3 in a 4 wire configuration. Same
> as the WiFi side, due to being the same chip and package, DLDO1 and
> DLDO2 regulator outputs from the PMIC provide overall power via VBAT and
> I/O power via VDDIO. The CLK_OUT_A clock output from the SoC provides
> the LPO low power clock at 32.768 kHz.
>
> This patch enables Bluetooth on this board, and also adds the missing
> LPO clock on the WiFi side. There is also a PCM connection for
> Bluetooth, but this is not covered here.
>
> The LPO clock is fed from CLK_OUT_A, which needs to be muxed on pin
> PI12. This can be represented in multiple ways. This patch puts the
> pinctrl property in the pin controller node. This is due to limitations
> in Linux, where pinmux settings, even the same one, can not be shared
> by multiple devices. Thus we cannot put it in both the WiFi and
> Bluetooth device nodes. Putting it the CCU node is another option, but
> Linux's CCU driver does not handle pinctrl. Also the pin controller is
> guaranteed to be initialized after the CCU, when clocks are available.
> And any other devices that use muxed pins are guaranteed to be
> initialized after the pin controller. Thus having the CLK_OUT_A pinmux
> reference be in the pin controller node is a good choice without having
> to deal with implementation issues.
>
> Signed-off-by: Pablo Greco <pgreco@...tosproject.org>
> ---
>  arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts b/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> index c87f2c0..15c22b0 100644
> --- a/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> +++ b/arch/arm/boot/dts/sun8i-v40-bananapi-m2-berry.dts
> @@ -96,6 +96,8 @@
>  	wifi_pwrseq: wifi_pwrseq {
>  		compatible = "mmc-pwrseq-simple";
>  		reset-gpios = <&pio 6 10 GPIO_ACTIVE_LOW>; /* PG10 WIFI_EN */
> +		clocks = <&ccu CLK_OUTA>;
> +		clock-names = "ext_clock";

So if you don't have that patch (that enables bluetooth) the wifi
doesn't work (even though the previous patch is supposed to enable it)
?

>  	};
>  };
>
> @@ -173,6 +175,7 @@
>
>  &pio {
>  	pinctrl-names = "default";
> +	pinctrl-0 = <&clk_out_a_pin>;

This one should bein the previous one as well

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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